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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5863beb9a565fe562cced5d5d0f53c09800709c0d15ba317d7fc7446c7930df' 
  AND token = 'FC7+YAQ7WWrm6r6JO8rae5Eb9pBTFwwTvj1Ep8Z/1K8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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