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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4572fe39cbea3d62e3af3ce2d016759a8433d5428f2e82a704e8af2052141efb' 
  AND token = 'oOhaLbqtjApedafzQ0W8uGjVUnjt9Ao8i+C8ENHuvzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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