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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adfe353cada8f57e591c7050c8a657515428f36296a82e25cccf49d6e103a1d5' 
  AND token = '7R06AbtnETZtxbwwSn0V+SuIR/LNW6Zfule5qNsIR+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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