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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b23221cdbcff2b362c833ba0e3560a83b21018668f7313fb9dd5b5051b18775e' 
  AND token = 'H/1dp/rG6dNEF8d/4jXXXk4pRLBh+XQBBvit3fRoixg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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