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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '363eb120a82ce41e03bd496d7c6b8b1c4370bcb7f25e8a5624924ab2e2988451' 
  AND token = 'yUhRqmQeHDxJ6j3Bn6fLztWPD1y4fHW4KKiLptV3RoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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