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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c9594b6762f86f4325e9824fd67462ec49a09ff491c699df8029e41b5476f20' 
  AND token = 'kgiwoDqyntifpzfsPQ58vkVX6Pd//kS3XJE7OBARdB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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