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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f32252a2d7bad13b80f2abbc152818bffd7b5f253c7d272f06add1817ee73299' 
  AND token = 'SQgY/wJvEG8ANCAjp02hGuLXBgIaVQacm/a7okPk2jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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