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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11a052d8865d34ac84845f747247fa732c8b82cd9b7411f648060ca5b8c0a908' 
  AND token = 'CNMs4bgnPXGW+jLjbONu+a1AI6VmbDYy4fl+DafLBKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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