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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc55e82c1c1ef8b13eca19494ef0a937731d36572c67b58fa5eefb164c3db5af' 
  AND token = 'iQAhz8F0kOngsPT15cxw1CugdPEPYpfa4FeXyShYkxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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