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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd890b4a2785d85a107c5a89f140f6909dcba722340c1cbec9f84ffc4e55b816f' 
  AND token = '0C3yhTLaDokTX9yeJM77B2XZ2BaQeW9+hobhqVvLvNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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