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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83e65884460846832aeb5dbb2baf556a05056bde054f66f69f5e6a1384dcbcdd' 
  AND token = 'jhukI0SbEE5Pdks2ynFmbfQtr5DIyQf4nKpUX6bZq/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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