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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b52e30b2a2f2cbe3a24b746254a08b9e882d29d1e39133b6bbc681e70c3531ef' 
  AND token = 'bOjwd+cpnOOaZnZUy2W85L4DhCDHRrqNs+qF0LmcBew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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