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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e44052e585758ef22570cea53db40973aa53eed73d28a35babfb70dac8afd69f' 
  AND token = 'AS8ASr1LTjV5a6YRtlBdJcBbLeaGYQDk+m4bj3tPDOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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