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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1733d66540b9a6600d3e168a07990bcf3f81efc38ed986061be4ebe2a5cea7fa' 
  AND token = 'VAZ6yDz/ZK+w9HQUrDr5nVoBq8//6kd6lO1yvS4W8qY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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