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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fb26ede21885dd037e05e617a93652b0006d35d18064fda3484204b15845004' 
  AND token = '6bnArs3SkZDURIM/WYC3XdstiNR9SaxPDv/We/ZOVw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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