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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c08c69e910e982d0ec9b7d5ab39a8877e9ee29dcfbbaa325bc38882b16a5181c' 
  AND token = 'fijxMiP0FOBcgCuUd9S6gF2ZW/Aa2WN9Y6PwRclpkE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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