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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d2c328eef427ff02fb05be037ef33d5a23f5e61644b6eb0befdf4bd220db3ae' 
  AND token = 'InO0FaDOvQq+mo6t1YvXEI1AyG7L7OvbG49QduX+6wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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