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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c18da24ca4bba598a33871da5aaae198431d63347e7b7180eb44814b9c78dac' 
  AND token = 'nH8ANu24cJywgOv38eqqJ9gnHbGTP9xy1twQRa2CwDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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