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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5a6fe22458344719fbe9b48cd55328f46b13838c22764c8025cec1ddb1cec3d' 
  AND token = 'b4X17gRG/HkmdOoBkEa6D/PScFvr6eUUFehkeulykcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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