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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '715d6dad18745d7b6a49e35396314319009b4d76dfce7b6df527d2e7c6c191d6' 
  AND token = '1eSPSTfbIR5eJoe/ow+y7Dt4w0Bl/731H/4L7fcmV8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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