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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '084dcd400e2aaa42c68673d8021255117fdf2071499b130e4083c0db96b8b6d1' 
  AND token = 'S6k4R4w/xpGLJBcgSkhtzAeDZt9zhLgPs9BsGK53aTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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