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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fecfbee765c0f62f6bb750e09894dad06277223e7f80d64ab390e6d63a0e01e3' 
  AND token = 'hPLasqV1rCTX/ijDhyx2E3mHNRRm/CsiGyIb7nQOCkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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