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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae32922b50deb97f12fa3a49326a30d839a68a1829aa484d6773501d45eac35e' 
  AND token = 'ZYcKddJ4oHOW5+RAMLQzt6MJuAFXyYwbEHkGxYzRS0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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