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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35a6ccad1d0af9f396d08a3ef1d0a1fac5ea747c53bc93cc63929956ae533987' 
  AND token = 'yuu9bryxETRGH5snbHjHg5ZlKt34nQH4bqFJoATq6jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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