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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '263a23c8e7ecdcc0bfc3516df630d58b9f16c02d99c145ab4f692614b2a1692e' 
  AND token = '0MOQlUSr9AU4IIviGh10iI6oz8cyEqr3NoaIAAf2vwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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