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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa619c9137e119738ecc8059b5054e261459fb07fb6cc6d5c3715905c54d7456' 
  AND token = 'P8GprlPy/P4mvb18u8ec3xz4B+lANFaXstKHBKex8yY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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