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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0736ac6ced2562fb17b3e27b1a0bae6dca14e27d0680d01a214c4625359c2327' 
  AND token = '2Y8sctz8HMkfZ6OU43z3SCZRFpX0a7svANMAedbHqm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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