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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df4f00ef0ae3a9a9db8f9d35c209a9d0230838ce672164892523865032dab1d9' 
  AND token = '6tVo1SB0wxtGepmU55n666dCl8sW/qK8OD7A4PBWZCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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