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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba03987a7a9d6217a5efc11eb558ecdcd38c8d977a31d192c645f45e93a28d5e' 
  AND token = '8+UmPLTyQEKZdQ8jLW9cOrqA2q4takgknHS3Vm8O5gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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