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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d3172dfd9d59317601741168f28d2c6daacadcbe3154872751a69f17e5b741f' 
  AND token = 'ORXZZy6EyQSmtA6hEztL2RHqWyNlIPhrVr1yUduPMoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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