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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c696bef0c263810ae02dcf0f81214712e61e2173ae7693da693ca28504952545' 
  AND token = 'pEEHhi+TUGNTYRGj5/84HJSfn63CMVNuUkmgo5Ukz3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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