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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1739a5c632cec58b6ed809d578baecaaf3b8f49ae67427f2f3705b47b392b2e7' 
  AND token = 'xQW685mzOHOeUx6EkVe2AY7eNY91X1t7hACPL4Kf4qY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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