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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15b54905595425f30e6060b7b265dc7ce808505d3c3624ba2e608aec6a1dc28b' 
  AND token = 'zGU5NsddX8P2p9JL+xyCS0vHa6ge80OcwkVTQIPxX/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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