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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f073e8b364d0bd1e990ad9695870bc90ab77d2f3bff609d2beb55cb1f2c9ec5d' 
  AND token = 'kx5M8nUg/22RBeD5nK37mlUic9HMsRJ1n0J4Sk0wt38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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