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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af43d0fd1f07ff0acb680210d89382c4e7e891851e2ee765971efc4fbb1f1b8e' 
  AND token = 'YBSBRKb9Ky9TWXjC1Jn9iiHwNPjotgjzI9RsL0V3aiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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