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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '028a117865c465cd2ec3148782c8e7fd9bc90c7ccab1aa24f15c27da68ae25e0' 
  AND token = '9YfG7v/7lwK94KXEIhTRXU3f5mckPa47F9uAdn0MNVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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