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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9f018c1947253e8354c187fc00479fb752c2001174cf2361b35c36fb7fd2f81' 
  AND token = 'T8lu4Hyiptx+mmlt5esQRJgE54Jc7MncjIQRiwC9hfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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