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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b4a31dc8b37b0d5d14d45a42d54351c86b5b5eeef9e572a2e0e7048a809ee28' 
  AND token = 'llCSdgZ6EdxEH0MvbscMest/bQ1uKXk8tg00Kb5At60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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