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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aafc0d354afa6ba3b34d065da6b6a095467a20eb2d03de02d2202e777cacce59' 
  AND token = 't4WT+ewRa/YUy6PBVLI3V4moAZImKDFWgUpr4Z5U6h8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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