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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '194371bce7323c4367c4583cd1a3bdf739c4e13a626b928b62f1459559b54ed6' 
  AND token = 'fjHh8TNWMvHfdfgwQnNok6iPvbI5BiOVIW5rBiqmHlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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