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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e56ea7a4499fe64481102d56ec6443b102a11d37f7766b9ea0c06dfe2f1b807' 
  AND token = 'ZP5P7qE2Jbyrn/2ytk38C5fVI6S+1Qk+KZHeKPTVLQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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