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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd0fef4b10a6c17ed0814d584318f8e0a8f9ce70282e08e7d5b7c4e6cdec3917' 
  AND token = 'xp0YmJFk+A5o0mtYF/OGK9GhRsN60QJ9h3C4tVrQ+9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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