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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bcb2f1b009d50ddb6c8724e9878d0884f1231383b6a46ee9c6427ab5ee337fd' 
  AND token = 'Nu0A9/Byg9B+nlv7840mg+DQBzSxeXXO3utFbnqyhV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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