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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2ff69994485df7a707d6e3e2f20f9fa9199e5f50efd6d60d306fde2ce4ee20f' 
  AND token = 'tZrdNZXRbl1KYJ/xXXcyR15yZgsPkK1+IDnr4eDDn/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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