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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '996e8e5e26597225c4fe0440f1a6a1935c6d0a3ed4c544b55de4d01c2a4934fc' 
  AND token = 'ZU9MLvHg5VLu3mib7oMIdaYVZYTNMsaBleJ0/ryKvnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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