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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '015e8d74a1e76b9175e06fb39661e8c6fb6f87f768ec7340d1d05ffdeb06a8cc' 
  AND token = 'x+TPEHrK5v0+9wfGfQUbd1Z5jXRdVfkyhbYMWnnUICI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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