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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35fd132de69a3c40e6fa48d8ea7aef4000729334851d40eaa28cea8290b4847e' 
  AND token = 'j+TkeWrp8+w6EnwSDOyfiNVRHuoqWPOQJNFaSrW1rV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}