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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e053260b680c1556bc4a4ff6bad450d93df7793de0b8403f8e68508b77e10ad' 
  AND token = '6firx4ap1+lXq5FnLrmqDf22XKfwZeVo3Pk42811Z48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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