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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '558fec3da5fb309f7f99cd5b7c3b7d69ef940035f2e62b44e23ffe88e78dd39c' 
  AND token = '8/besKc3OJTwUEaUtpm5p0pJrvTp6+ju+xzR9T/k4V0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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