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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '340787304e4da7724f69e0cecc772b7ee0a78927aecb0310795a921d1dc5cb7e' 
  AND token = 'pPFCQa+WyVfemh2avn3O+qfcHyDQhd92cmDN6N5FWHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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