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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34bd7a36910df533926af6ae1a135d59cf735cce57e97677de2cbefc0af0bda8' 
  AND token = 'YGjx0EekLkh9QiYKzX7fR4pYPbMM2BQ0kQTuBPsFalQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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