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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38a9d4a96601c0df6a89e41793d864591934c7d337e285e1e450e28aead90cd2' 
  AND token = 'IH13iCZtaU9uTtrYLhAoZ76a73Ay40EfE44OP7jgTtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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